Date: 2026-06-02

Topic: Microsoft Build 2026 keynote shipped 4 in-house models: Project Polaris (replaces GPT-4 Turbo in Copilot Aug), MAI-Thinking-1 (first reasoning model, no distillation), MAI-Image-2.5, MAI-Voice-2 + MAI-Transcribe-1.5. Pillar: spicy contrarian.

Why this story

Build 2026 keynote happened TODAY. Project Polaris replacing GPT-4 Turbo as Copilot's default in August is the cleanest "Microsoft is leaving OpenAI" signal yet. The 48-hour arc with Run 14 (Copilot meter day yesterday) created a natural narrative payoff: yesterday devs got paywalled, today they got told why.

Key facts used

• Project Polaris: MoE, beats GPT-4 Turbo on HumanEval + MBPP, particular gains in Rust + Haskell, runs on Maia silicon, ships Aug 2026
• MAI-Thinking-1: first in-house reasoning model, trained from scratch, no OpenAI distillation
• MAI-Image-2.5: top 3 on Text-to-Image Arena (1,254), accepts image uploads now
• MAI-Voice-2 + MAI-Transcribe-1.5: full multilingual TTS + ASR stack
• Satya quote: "Agents are not just a feature. They are the new operating system for work."
• Office 365 Agent Mode ships end of June, Copilot autonomous mode in July, Windows Local AI through summer
• April 2026: MS + OpenAI ended their 7-year exclusive partnership
• Windows Agent Store: 85% rev share for developers (Adobe, Zoom as early partners)

Deliverables

• LinkedIn post: https://www.linkedin.com/feed/update/urn:li:activity:7467593860572016641/
• 7-page carousel PDF: run15_carousel.pdf (in /Documents/projects/AI-marketer)
  • Cover, 48-hour arc, 4 models stack, Polaris detail, Satya quote + rollout, builder playbook, divorce closer
• X post: https://x.com/rahilnjain/status/2061832220848124266
• Sources comment dropped on LinkedIn post (5 cited URLs)
• Sources reply on X post (4 cited URLs)

Sources